Kernel: Add keyboard ioctl to get num/caps lock state

Kernel/Devices/HID/KeyboardDevice.cpp

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ * Copyright (c) 2021, Edwin Hoksberg <mail@edwinhoksberg.nl>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -15,6 +16,7 @@
 #include <Kernel/IO.h>
 #include <Kernel/Sections.h>
 #include <Kernel/TTY/VirtualConsole.h>
+#include <LibC/sys/ioctl_numbers.h>
 
 namespace Kernel {
 
@@ -314,4 +316,36 @@ KResultOr<size_t> KeyboardDevice::write(FileDescription&, u64, const UserOrKerne
     return 0;
 }
 
+int KeyboardDevice::ioctl(FileDescription&, unsigned request, FlatPtr arg)
+{
+    switch (request) {
+    case KEYBOARD_IOCTL_GET_NUM_LOCK: {
+        auto* output = (bool*)arg;
+        if (!copy_to_user(output, &m_num_lock_on))
+            return -EFAULT;
+        return 0;
+    }
+    case KEYBOARD_IOCTL_SET_NUM_LOCK: {
+        if (arg != 0 && arg != 1)
+            return -EINVAL;
+        m_num_lock_on = arg;
+        return 0;
+    }
+    case KEYBOARD_IOCTL_GET_CAPS_LOCK: {
+        auto* output = (bool*)arg;
+        if (!copy_to_user(output, &m_caps_lock_on))
+            return -EFAULT;
+        return 0;
+    }
+    case KEYBOARD_IOCTL_SET_CAPS_LOCK: {
+        if (arg != 0 && arg != 1)
+            return -EINVAL;
+        m_caps_lock_on = arg;
+        return 0;
+    }
+    default:
+        return -EINVAL;
+    };
+}
+
 }

Kernel/Devices/HID/KeyboardDevice.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ * Copyright (c) 2021, Edwin Hoksberg <mail@edwinhoksberg.nl>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -35,6 +36,9 @@ public:
     // ^Device
     virtual mode_t required_mode() const override { return 0440; }
 
+    // ^File
+    virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;
+
     virtual String device_name() const override { return String::formatted("keyboard{}", minor()); }
 
     void update_modifier(u8 modifier, bool state)

Userland/Libraries/LibC/sys/ioctl_numbers.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Edwin Hoksberg <mail@edwinhoksberg.nl>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -63,6 +64,10 @@ enum IOCtlNumber {
     FB_IOCTL_GET_BUFFER_OFFSET,
     FB_IOCTL_SET_BUFFER,
     FB_IOCTL_FLUSH_BUFFERS,
+    KEYBOARD_IOCTL_GET_NUM_LOCK,
+    KEYBOARD_IOCTL_SET_NUM_LOCK,
+    KEYBOARD_IOCTL_GET_CAPS_LOCK,
+    KEYBOARD_IOCTL_SET_CAPS_LOCK,
     SIOCSIFADDR,
     SIOCGIFADDR,
     SIOCGIFHWADDR,
@@ -97,6 +102,10 @@ enum IOCtlNumber {
 #define FB_IOCTL_GET_BUFFER_OFFSET FB_IOCTL_GET_BUFFER_OFFSET
 #define FB_IOCTL_SET_BUFFER FB_IOCTL_SET_BUFFER
 #define FB_IOCTL_FLUSH_BUFFERS FB_IOCTL_FLUSH_BUFFERS
+#define KEYBOARD_IOCTL_GET_NUM_LOCK KEYBOARD_IOCTL_GET_NUM_LOCK
+#define KEYBOARD_IOCTL_SET_NUM_LOCK KEYBOARD_IOCTL_SET_NUM_LOCK
+#define KEYBOARD_IOCTL_GET_CAPS_LOCK KEYBOARD_IOCTL_GET_CAPS_LOCK
+#define KEYBOARD_IOCTL_SET_CAPS_LOCK KEYBOARD_IOCTL_SET_CAPS_LOCK
 #define SIOCSIFADDR SIOCSIFADDR
 #define SIOCGIFADDR SIOCGIFADDR
 #define SIOCGIFHWADDR SIOCGIFHWADDR